Bipolar spin filter in a quantum dot molecule

Abstract

We show that the tunable hybridization between two lateral quantum dots connected to non-magnetic current leads in a `hanging-dot' configuration that can be used to implement a bipolar spin filter. The competition between Zeeman, exchange interaction, and interdot tunneling (molecular hybridization) yields a singlet-triplet transition of the double dot {\it ground state} that allows spin filtering in Coulomb blockade experiments. Its generic nature should make it broadly useful as a robust bidirectional spin polarizer.

5 pages, 3 figures (to appear in Appl. Phys. Lett.)

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Cited by in corpus (9)

• Full electrostatic control over polarized currents through spin-orbital Kondo effect
• Waiting time distribution revealing the internal spin dynamics in a double quantum dot
• Fano-Rashba effect in quantum dots
• Bound state in the continuum and spin filter in artificial molecules
• The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem
• Mixing of two-electron spin states in a semiconductor quantum dot
• Magnetic phases of one-dimensional lattices with 2 to 4 fermions per site
• Magnetism of quantum dot clusters: A Hubbard model study
• Phonon-assisted tunneling regimes in diatomic molecules